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Open Access Article
1 - Investigation of effect of tool geometry on formation of common defects, and mechanical properties of 5456 Aluminum alloy, in Friction Stir Lap Welded process
MOHAMMADREZA NADERI محمد علی صفرخانیان امیر حسین کوکبی امین عبداله زادهFriction stir welding is suitable for joining series 5000 alloys because no fusion welding problems arise for the alloys in this process. In this project, the effect of tool geometry on mechanical properties and formation of common defects in FSW such Kissing Bond defec MoreFriction stir welding is suitable for joining series 5000 alloys because no fusion welding problems arise for the alloys in this process. In this project, the effect of tool geometry on mechanical properties and formation of common defects in FSW such Kissing Bond defect and Hooking was investigated. Specimens were welded with three pin, that is, Cone with stair (stair at intersection of two sheets), frustum, and Tri-flute (rotating speeds: 650 , 500 rpm / welding speeds: 50, 25 mm/min). First, the macrostructure and microstructure of weld sections was investigated, and afterwards tensile shear test from retreating side as well as micro hardness test were examined. The results show that from among three pins which were used in this project, Tri-flute is the best pin simply because the specimens which were welded with this pin not only had an appropriate Hooking height, but also Kissing Bond was not destructive in these specimens. Manuscript profile -
Open Access Article
2 - Investigation of Nitride Bonding Fomation on Phase analysis, Microstructure and Mechanical Properties,of MgO-C Refractories
مهدی مهرآذین امیرعباس نوربخش سید علی حسن زاده تبریزیMgo-C refractories due to suitable properties which mainly related to presence of graphite and Carbon bonding are widely used in steel industry. The most disadvantages of these type of refractories is lack of bonding at high temperature. In the present work tried to inv MoreMgo-C refractories due to suitable properties which mainly related to presence of graphite and Carbon bonding are widely used in steel industry. The most disadvantages of these type of refractories is lack of bonding at high temperature. In the present work tried to investigate nitride bonding formation and effect on physical, mechanical properties, phase analysis and microstructure of samples. Result showed that because of presence of forsterite and silicon nitride together thermomechanical properties could be improved. Manuscript profile -
Open Access Article
3 - Applying of highly Ultraviolet reflective materials on cotton- nylon 66 fabric for camouflage of military targets in snowy areas
عباس بشارتی سیدانی فرید اخوان صدرIn this study, an appropriate coating was prepared by increasing ultraviolet reflectance of cotton-nylon 66 fabric for camouflage of military targets in the snowy areas. For this purpose, first several highly UV reflective compounds such as BaSO4, SiO2 and Polytetrafluo MoreIn this study, an appropriate coating was prepared by increasing ultraviolet reflectance of cotton-nylon 66 fabric for camouflage of military targets in the snowy areas. For this purpose, first several highly UV reflective compounds such as BaSO4, SiO2 and Polytetrafluoroethylene (PTFE) were applied on the fabric by using citric acid and sodium hypophosphite (SHP) and then grafted by heat treatment. The effects of the effective parameters including type and amount of compounds, amount of citric acid and SHP and temperature of heat treatment were investigated. Reflectance behavior and surface morphology of the fabric were studied by UV-Vis reflectance spectroscope and SEM, respectively. Results indicated that UV and visible reflectance increases up to 85% with applying of BaSO4 particles on the fabric. Thus a suitable fabric coating has been achieved for camouflage in the snowy areas. Excellent rubbing and washing durability of grafted BaSO4 particles on the fabric demonstrated that these particles have been attached on the fibers of the fabric with chemical bands, especially on the cotton fibers. Moreover, the used method in this study does not have any significant effect on the cotton and nylon 66 fibers structure. Parameters such as citric acid and SHP concentration and heat treatment temperature have an optimum amount and thus, using them more than this amount leads to decreasing UV and visible reflectance of applied fabric. Manuscript profile -
Open Access Article
4 - Effect of pH on the adsorption properties of zinc oxide-cadmium oxide nanoparticles for removal of methyl blue and methyl orange
Elahe Khalilifard Seye Ali Hasanzadeh Mojtaba Nasr EsfahaniZnO-CdO nanocomposite was synthesized by a W/O microemulsion method. Effect of calcination temperature on phase transformations, crystal size and specific surface area of ZnO-CdO nanocomposite were investigated. The synthesized Products were studied by the X-ray diffrac MoreZnO-CdO nanocomposite was synthesized by a W/O microemulsion method. Effect of calcination temperature on phase transformations, crystal size and specific surface area of ZnO-CdO nanocomposite were investigated. The synthesized Products were studied by the X-ray diffraction results (XRD), thermogravimetric and differential thermal analysis (DTA-TG), Brunauer–Emmett–Teller surface area measurement (BET), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Effect of pH on the removal of methyl blue and acid methyl orange was studied. XRD results showed that ZnO-CdO nanocomposites with crystallite size in nanometer scale were formed. Zinc oxide-cadmium oxide particles synthesized at 400 ˚C had the highest adsorption properties. The results showed that the adsorption of methyl blue and methyl orange on the surface of ZnO-CdO nanoparticles was higher at acidic conditions. Manuscript profile -
Open Access Article
5 - Investigation on Germanium Synergic extraction from synthetic solution
مهدی قراباغیIn this study, germanium synergic solvent extraction was investigated from synthetic acidic solution. Coal waste and zinc resources are the main resources for germanium extraction. Usually hydrometallurgical methods are used in procedure for germanium recovery. Di(2-eth MoreIn this study, germanium synergic solvent extraction was investigated from synthetic acidic solution. Coal waste and zinc resources are the main resources for germanium extraction. Usually hydrometallurgical methods are used in procedure for germanium recovery. Di(2-ethylhexyl) phosphoric acid (D2EHPA) and LIX 63 were used to separate germanium form solution. The effects of pH, extraction time and stirring speed were investigated and results showed that the optimum pH was lower than 0.2. The optimum time was 3 minutes and in this time equilibrium was reached. By optimization of the parameters, more than 87% of germanium was extracted. Manuscript profile -
Open Access Article
6 - Investigation of microstructure and mechanical properties of AISI304L Stainless Steel to ASTMA514 Steel joint by Gas Tungsten Arc Welding
موسی توکلی عباس سعادت محمدرضا خانزاده قره شیرانIn the present study, Dissimilar welding of austenitic stainless steel AISI 304L to Quenched and Tempered Steel ASTM A514 was investigated by gas tungsten arc welding process. Two filler metals including (ERNiCr-3) and austenitic stainless steel 309l (ER309L MoreIn the present study, Dissimilar welding of austenitic stainless steel AISI 304L to Quenched and Tempered Steel ASTM A514 was investigated by gas tungsten arc welding process. Two filler metals including (ERNiCr-3) and austenitic stainless steel 309l (ER309L) were used. Microstructure of nugget, heat affected zone, inter face and unmixed zone (UMZ) was studied by optic microscopy and scanning electron microscopy equipped with energy disperse spectrometry (EDS). The investigations showed completely austenitic structure as dendrite for ERNiCr-3 weld metal and primary ferrite with austenitic matrix for 309l weld metal. Mechanical properties including tensile and bending strength, impact resistance, hardness and fractography of the specimen was studied. The entire specimen underwent ductile fracture in HAZ in the tension test. Tensile strength in ER309L and ERNiCr-3 had increment of 556 Mpa and 593 Mpa respectively. Impact thoughtless in join induced by ERNiCr-3 filler was 117 J while it was 95 J for ER309L. The maximum and minimum hardness was related to the ERNiCr-3 (156 Vickers) and ER309L (127 Vickers), respectively. Finally, according to mechanical properties, it can be concluded that in dissimilar welding of austenitic stainless steel AISI 304 L to Quenched- Tempered Steel ASTM A514, The ERNiCr-3 filler is better than ER309L. Manuscript profile -
Open Access Article
7 - The effect of heat treatment and copper on the tensile properties and quality index of Al-7Si-0.35Mg-xFe alloys
رضا تقی آبادی محمد تلافی نوغانی یلدا کریمی مهسا ایرانشاهی مریم نظریIn this study, the effect of Cu addition (0.5, 1.0 and 1.5 wt%) and T6 heat treatment on the tensile properties and quality index of A356 alloy containing different amount of iron (0.5-1.5 wt%) was investigated. According to the results in as-cast condition, the additio MoreIn this study, the effect of Cu addition (0.5, 1.0 and 1.5 wt%) and T6 heat treatment on the tensile properties and quality index of A356 alloy containing different amount of iron (0.5-1.5 wt%) was investigated. According to the results in as-cast condition, the addition of copper to the iron bearing alloys increased the tensile strength by about 25% while substantially decreased the percent elongation (by almost 80%). After heat treatment, however, the tensile strength and the quality index of the alloy containing 1 wt% copper and 1.5 wt% iron were found to be increased by about 100 and 35% as compared to the base alloy, respectively. The improvement in the quality index was attributed to the precipitation hardening effect of Al2Cu and Mg2Si precipitates as well as thermal modification of eutectic silicon and iron-rich platelets, which increase the tensile strength, and ductility of the alloy. Manuscript profile -
Open Access Article
8 - Synthesis of ZnWO4 nanoparticles and manufacturing scintillator for detecting Gama- rays
رسول صراف ماموری آرزو عبدالرحمانی خیراله محمدی محسن روشنIn this study, ZnWO4 nanoparticles were synthesized through co-precipitation method with sodium tungstate dehydrate (Na2WO4.2H2O) and zinc nitrate hexahydrate (Zn (NO3)2.6H2O) as starting materials. In order to optimize the conditions for obtaining smallest mean particl MoreIn this study, ZnWO4 nanoparticles were synthesized through co-precipitation method with sodium tungstate dehydrate (Na2WO4.2H2O) and zinc nitrate hexahydrate (Zn (NO3)2.6H2O) as starting materials. In order to optimize the conditions for obtaining smallest mean particle size, Central Composite Design (CCD) was used and three parameters of temperature, weight ratio of precursors, and pH value were studied in five levels. The obtained ZnWO4 nanoparticles were characterized by Field Emission Scanning Electron Microscopy (FE-SEM), powder x-ray diffraction (XRD), thermal gravimetric- differential scanning calorimetry (TG-DSC) and photoluminescence (PL). The results showed that optimal conditions for smallest mean nanoparticles with particle size of 37.3 6.9 nm were temperature =83 , weight ratio of precursor equal to 1.1, and pH=6. The resulting ZnWO4 nanoparticles were dry- pressed to green compact pellets with a diameter of 11mm and thickness of 1.5 nm at the compaction pressure of 500 MPa. The densification of nanoparticles compacts was carried out by a pressure less sintering at 950 for 2 hours in air atmosphere. Scintillation properties of pellets were determined by means of Gama-rays spectroscopy. The results showed that manufactured ZnWO4 pellets illustrated counting sensitivity to Cs137 and Am241 irradiation sources and couldn’t detect energy of Gama-rays emitted from this two source. Manuscript profile -
Open Access Article
9 - The Effect of Electrical Discharge Machining Parameters On 2024 Aluminum-Based Composite Material Using Calculation and Analysis of the Total Normalized Quality Loss and Signal-to-Noise Analysis
Behnam Masoudi saeed daneshmandMetal matrix composites, according to the type of reinforcement used, have a different machinability. 2024 Aluminum matrix composites reinforced with aluminum oxide is among the materials the machining of which through traditional methods leads to the rapid wear of the MoreMetal matrix composites, according to the type of reinforcement used, have a different machinability. 2024 Aluminum matrix composites reinforced with aluminum oxide is among the materials the machining of which through traditional methods leads to the rapid wear of the tool; hence, EDM is a suitable method for machining this class of materials. Given that this machining method has different parameters, optimal set of machining parameters has a major effect on machining time, surface quality and tool wear rate. Using calculation and analysis of the total normalized quality loss (TNQL) and simultaneous signal to noise ratio of the outputs, this research is an attempt to investigate the effect of EDM parameters including current intensity, voltage, pulse on-time, and pulse off-time on material removal rate, tool wear rate and surface roughness in a the states of with and without powder and rotary tool. The results showed that current intensity and then pulse on-time, pulse off-time, and voltage have respectively the most important effect on output parameters of machining. The use of aluminum oxide powder and rotary tool increases gap and creates a centrifugal force and hence moves particles away from the area of machining and finally increases MRR. The use of aluminum powder in collision with sparks makes the sparks smaller and reduces their penetration depth and, thus, reduces the surface roughness. The results of optimization without powder and rotary tool proposes the combination of parameters as A3B1C2D3 while with powder and rotary tool proposes the combination of parameters as A1B1C2D3. Manuscript profile -
Open Access Article
10 - The effect of thermomechanical parameters on texture behavior of AZ63 magnesium alloy
غلامرضا ابراهیمی مهدی کاویانیHot compression test was carried out on extruded AZ63 magnesium alloy samples to investigation of the effect of thermomechanical parameters on AZ63 magnesium alloy texture behavior. At first, samples have been machined on two extruded direction (ED) and normal direction MoreHot compression test was carried out on extruded AZ63 magnesium alloy samples to investigation of the effect of thermomechanical parameters on AZ63 magnesium alloy texture behavior. At first, samples have been machined on two extruded direction (ED) and normal direction (ND). Then, hot compression test performed at 250 °C and strain rates of 0.01 s-1 and 1 s-1 and various strain. Microstructural investigation and texture evolution reveal that tensile twinning leading to basal texture improvement in roll direction (RD=ED) and compressive twinning causes changing texture align transverse direction (TD) at primarily strain during hot compression test. Also, observation of Texture evolution by pole figures indicate that dynamic recrystallization reduces basal texture intensity in ND samples at high strains. Manuscript profile -
Open Access Article
11 - Synthesis and characterization of Fe2O3/BaFe12O19 nanorods and investigation of their magnetic properties
محمد جزیره پور هرمزی محمد حسین شمسIn this paper Fe2O3/BaFe12O19 nanorods were synthesized by a simple low-cost hydrothermal process with large scale production capability. Morphologic characteristics of nanorods such as length, diameter and aspect ratio were controllable. EDTA was used in the synthesis MoreIn this paper Fe2O3/BaFe12O19 nanorods were synthesized by a simple low-cost hydrothermal process with large scale production capability. Morphologic characteristics of nanorods such as length, diameter and aspect ratio were controllable. EDTA was used in the synthesis process as the growth control agent. In this investigation the effects of different parameters such as temperature (115, 150 and 180 °C), time (5, 10, 40 h), growth controlling agent (EDTA, PEG400, PEG6000, CA) and basic agent (NaOH and NH3) were also studied. In different conditions different morphologies like spheres with a diameter of 50-100 nm and nanorods with diameters of 50-400 nm and lengths of 1-10 μm were synthesized. Morphological characteristics of the samples were studied by scanning electron microscope (SEM) and magnetic properties were measured by alternative gradient force magnetometer (AGFM). The nanorods of this research could be used for heavy metal ions removal from waste water, catalysts, solar cells and microwave absorbing materials. Manuscript profile -
Open Access Article
12 - Investigation of adding Cr2O3 on mechanical properties and high temperature oxidation behavior of Stellit6 coating prepared by plasma spraying on IN-738
mostafa tahari Mohammad Gavahian Mohammad Jahanbaze Mohammad NajafiIn this study, the effect of adding chromium oxide on mechanical properties and high temperature oxidation behavior of thermal sprayed stellite 6 coating on IN-738 has been investigated. For this purpose, first the 0, 10, 20 and 30 %wt. Cr2O3 powder added to satellite6 MoreIn this study, the effect of adding chromium oxide on mechanical properties and high temperature oxidation behavior of thermal sprayed stellite 6 coating on IN-738 has been investigated. For this purpose, first the 0, 10, 20 and 30 %wt. Cr2O3 powder added to satellite6 and plasma sprayed on the IN_738 substrate after mixing by mechanical milling. The optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffractometer (XRD) and micro-hardness used for micro-structure, porosity and phase analysis investigation. The isothermal oxidation behavior of composite coatings at 650, 750 and 850 ° C for 50 hours were evaluated. Results shows, the stellit6 / %10wt. Cr2O3 coating has the lowest oxidation rate. On the other hand, this coating shows the higher hardness other than non-reinforcement coating. The phase analysis investigation shows that the Cr2O3 oxide layer is forms during oxidation process on the surface of coatings. Its shows the Cr2O3 reinforcement is preferred areas for chromium oxides in thermal grown oxide (TGO) during oxidation Manuscript profile -
Open Access Article
13 - Investigation of the electrochemical activity of paladium-carbon nanotubes nanocomposite toward methanol oxidation in fuel cells and comparing it with the platinium one
Roghayeh KhaleghianmoghadamIn this study, the nanocomposite of palladium-carbon nanotubes-chitosan was synthesized and characterized by XRD and TEM techniques. The synthesized nanocomposite was used for the modification of glassy carbon electrods surfaces. Using cyclic voltammetry (CV) technique, MoreIn this study, the nanocomposite of palladium-carbon nanotubes-chitosan was synthesized and characterized by XRD and TEM techniques. The synthesized nanocomposite was used for the modification of glassy carbon electrods surfaces. Using cyclic voltammetry (CV) technique, the electrochemical activity of modified electrode (GC/PdNPs-MWCNTs-CH) toward methanol oxidation was investigted in a solution of 0.5 M sodium hydroxide and 1.0 M methanol. The results revealed that the synthesized nanocomposite shows a high catalytic activity toward methanol oxidation and thus has an efficiency for use as anode for the methanol fuel cells. The effects of different parameters such as methanol and electrolyte concentrations, potential range, and potential scan reate on the anodic current density and the peak potential of methanol oxidation were also investigted. Moreover, comparing the electrochemical activity of the palladiun nanocatalyst for methanol oxidation with that of the platinum-type, it was concluded that the former has a considerable activity closed to the platinum one. Therefore, it coulde be a souitable substituer for platinum in the methonl oxidation process. This substitution, also reduces the catalyst price. Manuscript profile
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